<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img class="logo" src="../assets/favicon.png" alt="" />
        <span>黑白喵子管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主要区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px' ">
        <div class="toggle-button">
          <i :class=" iconFlod[i] " @click=" active_flod " :key="i" ></i>
        </div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#E6F1D8"
          text-color="#83C75D"
          active-text-color="#F3C246"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/' + subItem.path + ''"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右边主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 折叠侧边栏状态管理
      i: 1,
      isCollapse: false,
      // 被激活的链接地址
      activePath: '',
      // 左侧菜单数据
      menulist: [],
      iconObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      iconFlod: {
        '1': 'el-icon-s-unfold',
        '2': 'el-icon-s-fold'
      }
    }
  },
  //   调用生命周期函数
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 点击按钮,切换菜单的折叠与展开
    active_flod() {
      if ( this.i === 1) {
        this.isCollapse = true
        return ++this.i
      } if ( this.i === 2) {
        this.isCollapse = !this.isCollapse
        return --this.i
      }
    },
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      // console.log(res)
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      // 二次点击时再次赋值
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #FCE0A6;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #e6f1d8;
  .el-menu {
    border-right: none;
  }
  .toggle-button {
    background-color: #AFD788;
    text-align: center;
    color: #FCF54C;
    line-height: 24px;
    font-size: 22px;
    cursor: pointer;
  }
}
.el-main {
  background-color: #6EC3C9;
}
.iconfont {
  margin-right: 10px;
}
.el-button{
  background-color: #94AAD6;
}
</style>
